Theory And Method For Design Of An Inspection Well In Heating Project

Theoretical calculations and numerical method can be used in design of inspection well. According to boundary conditions, a slab can be simply supported, fixed and elastically fixed. Numerical methods can be used to calculate internal forces for a single slab or an inspection well as a whole. In the actual engineering design, we need to determine which way is suitable. At present for a slab without openings, both theoretical method and numerical computation has reached a satisfactory level, but for a slab with an opening, computation method of its internal forces needs to be further studied. At the same time as a result of the operation of heatint pipes, temperature of the inspection well goes up and down in a year. The thermal stress in the slabs of an inspection well will be large enough and need to be calculated.This paper introduces simplified models and calculation methods for structural design of an inspection well, and focuses are put on the problems mentioned above. Those problems include: how to deal with the connection between slabs, how to calculate internal forces for a slab with an opening, and how to determine the temperature within a slab.Through comparison on typical wells, elastical fixing is thought better than other boundary conditions, in terms of simplicity of calculation and economy of steel cost. As to a slab with opening, an increase coefficient is adopted in calculation of internal forces of the slab. The influences of the size and location of the onpening on internal forces and deformation are also discussed, which shows that the stronger the boundary of the slab is, the smaller the influences of the opening are. At last, empirical formulae are put forward to calculate the temperature difference between inner side and outer side of the plates of an inspection well.The results of this paper provides a good reference for design and further research of inspection well and other underground structures.